Lecture one, with the formulas and tricks
Drashti Gada · YouTube
The six ratios, the standard-angle table and the identities, built up from the start.
Trigonometry
Chapter 6 of Geometry, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Practice Set 6.1 solved
JR Tutorials · YouTube
The first practice set worked sum by sum.
Practice Set 6.1 from another teacher
Yogesh Sir's Backbenchers · YouTube
Same set, different approach — useful if the identity manipulations are not clicking.